David Walsh Blog

• By David WalshAugust 3, 2020

  Promise.allSettled

  The Promise object has many useful functions like all, resolve, reject, and race -- stuff we use all the time. One function that many don't know about is Promise.allSettled, a function that fires when all promises in an array are settled, regardless of whether...

• By David WalshJuly 31, 2020

  Tips for Starting with Bitcoin and Cryptocurrencies

  One of the most rewarding experiences of my life, both financially and logically, has been buying and managing cryptocurrencies like Bitcoin, Litecoin, Ethereum. Like learning any other new tech, I made rookie mistakes along the way, but learned some best practices along the way. Check out...

• By David WalshJuly 24, 2020

  5 Most Common Developer Portfolio Mistakes

  A portfolio site is one of the best marketing and sales tools you as a web developer have in your arsenal. And if it’s set up right, it’ll save you a bunch of time having to: Chase down new clients, Spend time convincing them to work with you,Answer...

• By David WalshJuly 20, 2020

  Binding Arguments with Bind

  One of my favorite and most essential Function method is bind, a function we added to MooTools when it wasn't featured in the JavaScript language itself. We often think of using bind to simply bind a method's call to its host object, but did you...

• By David WalshJuly 13, 2020

  Lazy Load IFRAMEs

  We've known for a decade that lazy loading resources like JavaScript, CSS, and especially images is a massive performance win for web pages. At first we used tricks and JavaScript to do the lazy loading, but more recently native image lazy loading has debuted...

• By David WalshJuly 12, 2020

  Easy Stock Market Quotes with marketstack

  The stock market is wild right now, at least in the United States. Between pandemic, political events, and everything else going on, the stock market is one swing after another. There are a host of services that give you stock quotes but I don't trust them;...

• By David WalshJuly 9, 2020

  Automatically Rebase GitHub Pull Requests

  Working on an open source project with a thriving contribution community is one of the great joys I have at Mozilla. In leading this charge, I get to meet amazing people of all different skill sets and interests, as well as different points of...

• By David WalshJuly 6, 2020

  Get Worldwide Postal Code Data with Zip Code API

  Accurate shipping and location information is well worth the price you need to pay for it. You can sell that information, you can target consumers to perfection, and save yourself loads of frustration when it comes to shipping. Creating your own location API isn't worth the...

• By David WalshJune 30, 2020

  JavaScript in SVGs

  SVGs are such an amazing tool for creating custom fonts, animations, size-reduced graphics, and more. They're part HTML, part image, and all awesome. Many websites have moved toward SVG instead of JPG, GIF, and PNG due to the flexibility that SVG provides.Whats one example...

• By David WalshJune 23, 2020

  CSS background-repeat: round

  The CSS spec is full of gems that sneak their way past most of us web designers and developers. Stuff like :focus-within, prefers-reduced-motion, and prefers-color-scheme suddenly make their way into CSS without us really finding out for months or years. One such...